const path = require('path')
const VueLoaderPlugin = require('vue-loader/lib/plugin')
const isDev = process.env.NODE_ENV === 'development'
const HTMLPlugin = require('html-webpack-plugin')
const webpack = require('webpack')
const ExtractPlugin = require('extract-text-webpack-plugin')

const config = {
    target:'web',
    entry: path.join(__dirname,'src/index.js'),
    output:{
        filename:'bundle.[hash:8].js',
        path:path.join(__dirname,'dist')
    },
    module:{
        rules:[
            {
                test:/\.vue$/,
                loader:'vue-loader'
            },
            {
                test:/\.jsx$/,
                loader:'babel-loader'
            },
            {
                test:/\.(jpg|gif|jpeg|png|svg)$/,
                use:[
                    {
                        loader:'url-loader',
                        options:{
                            limit:1024,
                            name:'[name]-pp.[ext]'
                        }
                    }
                ]
            }
        ]
    },
    plugins:[
        new webpack.DefinePlugin({
            'process.env':{
                NODE_ENV: isDev ? '"development"' : '"production"'
            }
        }),
        new VueLoaderPlugin(),
        new HTMLPlugin()
    ]
}

if (isDev){
    config.module.rules.push({
                test:/\.styl/,
                use:['style-loader',
                'css-loader',
                {
                    loader:'postcss-loader',
                    options:{
                        sourceMap:true
                    }
                },
                'stylus-loader']
            },)
    config.devtool= '#cheap-module-eval-source-map'
    config.devServer = {
        port:8000,
        host:'0.0.0.0',
        overlay:{
            errors:true,
        },
        // open:true,
        hot:true
    }
    config.plugins.push(
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NoEmitOnErrorsPlugin()
    )
}else{
    config.entry = {
        app:path.join(__dirname,'src/index.js'),
        vendor:['vue']
    }
    config.optimization = {
        splitChunks: {
            cacheGroups: {
                commons: {
                chunks: 'initial',
                minChunks: 2, maxInitialRequests: 5,
                minSize: 0
                },
                vendor: {
                test: /node_modules/,
                chunks: 'initial',
                name: 'vendor',
                priority: 10,
                enforce: true
                }
            }
        }
    }
    config.output.filename = '[name].[chunkhash:8].js'
    config.module.rules.push(
       {
                test:/\.styl/,
                use:ExtractPlugin.extract({
                    fallback:'style-loader',
                    use:[
                        'css-loader',
                        {
                            loader:'postcss-loader',
                            options:{
                                sourceMap:true
                            }
                        },
                        'stylus-loader']
                })
            },
    )
    config.plugins.push(
        new ExtractPlugin('styles.[md5:contentHash:8].css'),
        // new webpack.optimize.CommonsChunkPlugin({
        //     name:'vendor'
        // })
    )
}

module.exports = config